Perspective also makes airplanes appears to get closer to the ground as they travel away from you. Are you really this confused or amazed by the laws of perspective?
Let me show you how perspective works.
On a spherical Earth, it's simple.
Say you had a really long cloud, 2 people at different points would be able to see different parts of it, as the cloud curves along with the Earth.
Now let's say we have a flat Earth with a long thin plane that goes across it:
The plane appears to get thinner as it gets closer to the horizon. But it never touches the horizon.
It simply can't appear to touch the horizon, because it isn't actually touching it.As long as the plane is not touching the ground at all, there will always be that little gap at the horizon. On the photo I showed in the original post, the clouds clearly appear to be touching the horizon.
And in the example I just showed, that is a plane that stretches across the whole flat Earth. You don't get clouds that big, so there would be a
considerably larger gap between the horizon and the plane.
And again, what you said about aeroplanes...
Perspective also makes airplanes appears to get closer to the ground as they travel away from you.
You can clearly see planes fly over the horizon. This is not at all possible on a flat Earth.